how to add new column to existing table with value from excel?

hi i have a application which is used to import the excel sheet into database,in this case i need to maintain same columns iin table which excel sheet have,i maintaine it,and i have uploaded the excel sheet,using below code,in this code i need to select the table to import te excel sheet........my doubt is some other times i need to insert one or extra columns with data to same table from excel sheet.....how it is possible,can any one please teel me ....

Responses

Before inserting data to existing table you are deleting all records by using TRUNCATE...So you can check the column count of both excel file and table and if NOT matched then import excel data to new table...